feat(drtm): update drtm setup function

feat(drtm): update drtm setup function

Updated DRTM setup functionality that mainly does below 2 things
1. Initialise the DRTM DMA protection, this function assumes the
   platform must support complete DMA protection.
2. Initialise the Crypto module that will be useful to calculate
   the hash of various DRTM element involved.

Signed-off-by: Manish V Badarkhe <manish.badarkhe@arm.com>
Signed-off-by: Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
Change-Id: I3d6e4d534686d391fa7626094d2b2535dac74e00